Acta Cryst. (2009). E65, o2402  [ doi:10.1107/S1600536809035600 ]

Dehydroabietic acid

X.-P. Rao, Z.-Q. Song and S.-B. Shang

Abstract: The title compound [systematic name: (1R,4aS,10aR)-7-isopropyl-1,4a-dimethyl-1,2,3,4,4a,9,10,10a-octahydrophenanthrene-1-carboxylic acid], C₂₀H₂₈O₂, has been isolated from disproportionated rosin which is obtained by isomerizing gum rosin with a Pd-C catalyst.. Two crystallographically independent molecules exist in the asymmetric unit. In each molecule, there are three six-membered rings, which adopt planar, half-chair and chair conformations. The two cyclohexane rings form a trans ring junction with the two methyl groups in axial positions. The crystal structure is stabilized by intermolecular O-HO hydrogen bonds.

Online 9 September 2009

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